Finding the Third Proportional to 142,399.50 and 303,207

Step by Step Solution

1. Step 1: Write the proportion equation
   142,399.50 : 303,207 = 303,207 : x
2. Step 2: Convert to fraction form
   142,399.50/303,207 = 303,207/x
3. Step 3: Cross multiply
   142,399.50x = 303,207 × 303,207
4. Step 4: Simplify right side
   142,399.50x = 91,934,484,849
5. Step 5: Solve for x
   x = 91,934,484,849/142,399.50
6. Step 6: Final answer
   x = 645,609.60